The equation of the regression line is Y = a + bX. Match the following symbols to the description to the right. 1. Denotes the variable plotted on the horizontal axis and called the explanatory or independent variable. Y 2. Denotes the variable plotted on the vertical axis and is called the response or dependent variable. R 3. The regression result = the change a in Y for a change in X of +1, and called the slope. b 4. The proportion of the variability of Y that is explained by or accountable to X. X 5. The strength and direction of the linear relationship between X and Y. 6. The regression result = elevation of the line at X=0, and called the intercept